Assigxoe of oxe-half to



(No Model.) I

N. ROUSISEAU.

INSULATOR.

No. 289,449! Patented 1390.4, 1883.

' JTZ rnn TUNTTED STATES PATENT @FFlClEo NECTER ROUSSEAU, OF CHICAGO,ILLINOIS, ASSIGXOR OF ONE-HALF TO JAMES XV. BRENNAN, OF SAME PLACE.

INSULATOR.

SPECIFIUATION forming part of Letters Patent No. 289,449, dated December4:, 1883. Application filed March 521, 1888. (No model.)

To all whom it may concern:

Be it known that I, Nnc'ain ROUSSEAU, a citizen of the United States,residing at Chicago, in the county of Cool; and State of Illinois, haveinvented certain new and useful Improvements in Insulators iorElectriclVires, of which the following is a full, clear, and exactdescription.

In constructing insulators by which electric wires are suspended it isusual to provide them with what are known as storm-shields, which serveto prevent the short-circuiting of the currents by the water or moisturewhich in stormy weather adheres to the sides of the insulators. The mostusual form of insulator is one somewhat in shape of an inverted cup,which is held upon the cross-arms of the telegraph-pole by means of acentral pin, which iits within the cup in such manner as to leave aspace between the lower inner sides of the cup and the bottom of thepin. \Vith this class of insulators, however, it sometimes happens thatthis space, which is just above the cross-arm, becomes partially filledwith dust or soot, which collects within the space and upon thecrossarm, and in severe storms the rain, splashing upon the cross-arm,wets the dust in the space, and allows the current to escape through thesame and the wet crossarms and pole to the ground. Again, when this formof insulator is employed upon lines which are dividedas at someway-station the ends of the divided wire, if attached to separateinsulators, have a tendency to pull the same off the cross-arms, sincethe strain of the portion of the wire attached to each in sulator is inbut one direction.

The object of my present invention is to provide an insulator whichshall better guard against the escape of the electric current, and whichshall more effectually insulate and better sustain the ends of a dividedwire. This object I have accomplished by the construction of insulatorhereinafter described, illustrated in the accompanying drawings, andparticularly defined in the claim at the end of this specification.

Figure 1 is a view in side elevation of my improved insulator.

Fig. 2 is a view of the same in vertical section. Fig. 3 is a view inside elevation of a modified form of insulator.

Referring to Figs. 1 and 2, A designates the insulator, composed ofglass, porcelain, or other suitable material, and held upon thecross-arm B by means of the wooden pin C, fitted within the centralthreaded socket oi the insulator. The part of the insulator next thecross-arm is cut away to form the space ct between the pin C and theinner or lower shield, a. Above the shield a is formed the groove a forone end, \V, of a divided wire, and above this groove is formed thespace a, between the body of the insulator and the outer shield, of. Thegroove a above the outer shield, receives the other end, X of the wire.

From the above-described construction it will be seen that the ends ofthe divided wire being connected to the same insulator, the strain uponone side of the insulator is offset by that upon the other, and there isnot that tendency to draw the insulator from the crossarm which wouldexist were but one end of the wire connected to the insulator. Theshield c serves, as in the old form of insulator, to insulate theportion \V of the wire from the pin 0, and the shield a" effectuallyinsulates the part IV of the wire from the part IV, thus allowing thecurrent to pass to a way-station by wires connected to the ends to. Asthe shield a is exposed to the rain, it is kept clean, and there ishence less danger of dust and dirt collecting in the space (6'' than inthe space a, which is immediately above the cross-arm, and, moreover,there is no danger of water being splashed into the space a in case ofsevere storms, so that this space is always dry. For this reason the useof this construction of insulatorwill be found of great advantage, evenwhere the wire is not to be divided and the single groove (L5 isemployed.

In Fig. 8 is shown a form of insulator adapted to be attached to theunder side of the cross-arm, or in other positions where it would beimpracticable to place an insulator in vertical position. In this formthe wire V is insulated from the cross-arm by the space a and from thewire XV by the space a".

Having thus described my invention, what I In testimony whereof I havehereunto set my 10 claim as new, and desire to secure by Letters handthis 19th day of March, A. D. 1883. Patent, is

As a new article of manufacture, an insu- NEGTER-ROUSSEAU.

5 later for electric wires, having two stormshields and two grooves forwires, one of said In presence ofgrooves beinglocated between the twoshields G110. P. FISHER, J1-., and the other being located beyond thetwo JAMES H. P13112013. shields, substantially as described.

